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  • 1
    Electronic Resource
    Electronic Resource
    X-ray determination of crystallinity and orientation in poly(ethylene terephthalate) (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 4 (1966), S. 951-958 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The measurement of crystallinity and orientation in poly(ethylene terephthalate) is discussed. A simple procedure is given for the estimation of orientation from the (105) plane, and it is shown that methods which use the equatorial planes are subject to certain disadvantages. In addition a method is given for the measurement of x-ray crystallinity. The technique is applied to fibers and films of various treatments and a linear relation is found between density and x-ray crystallinity.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1966.160040610
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  • 2
    Electronic Resource
    Electronic Resource
    Studies on poly(aquahydroxychromium diphenylphosphinate)Presented to Division of Organic Coatings and Plastics Chemistry, 150th National Meeting of the American Chemical Society, Atlantic City, N. J., September 12-17, 1965. (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 1277-1289 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The novel inorganic polymer poly(aquahydroxychromium diphenylphosphinate) was investigated to obtain information concerning its degree of polydispersity and properties when dissolved in organic solvents. Viscometric, infrared absorption spectroscopic, and electrical conductimetric techniques were employed to ascertain the characteristics of the polymer dissolved in benzene, chlorobenzene, and chloroform. Gel permeation chromatography was used to determine the degree of heterogeneity of the polymer. Results indicate that the polymer, as prepared, is quite polydisperse. The polymer main chains do not undergo radical reactions with the solvents. High values of the Huggins interaction constant K′ suggest that polymer-solvent association reactions involving chain-endgroups are probable. Such reactions are also indicated by association constant values and by the shapes of phoreograms obtained from electrical conductance data. Both “local” and “bulk” solvent properties, such as the dielectric constant, appear to influence the characteristics of the polymer when dissolved in the different solvents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1966.150040525
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  • 3
    Electronic Resource
    Electronic Resource
    Role of cations in radiation grafting and homopolymerization (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 7 (1969), S. 1379-1384 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The grafting of acrylic acid in aqueous solution to nylon 6 film has been studied in the presence of ferrous, ferric, and cupric salts. The mutual irradiation technique was adopted using a 60Co source. The anions were found to have no effect on the grafting or homopolymerization, but both of these processes were suppressed by the cations in the following order of effectiveness: Cu2+ 〉 Fe2+ 〉 Fe3+. The rate constant for the capture of hydroxyl radicals by acrylic acid has been determined as 6 × 109 1. mole-1 sec-1 by pulse radiolysis using the CNS- competition method. By invoking this result, mechanisms have been suggested for the process of chain termination by metal cations.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.150070601
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  • 4
    Electronic Resource
    Electronic Resource
    A new series of organoboranes. VII. The preparation of poly-m-carboranylenesiloxanesPresented at the 150th Meeting, American Chemical Society, Atlantic City, New Jersey, September 17, 1965. (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 1623-1636 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This paper describes the preparation of the first members of a new series of polysiloxanes characterized by having m-carborane nuclei in the backbone of the polymers. Although neither hydrolysis of 1,7-bis(chlorodialkylsilyl)-m-carborane monomers nor catalytic dehydration of the corresponding dihydroxy compounds would proceed to give the type of polysiloxanes desired, the polymers were readily prepared by the ferric chloridecatalyzed elimination of an alkyl halide from equimolar mixtures of dichloro- and dialkoxysilanes. This technique allowed the systematic introduction of dialkylsiloxy groups between m-carborane nuclei. Characterization of the polymers is described as well as differential scanning calorimetry studies which show the prime members of the series to be thermally stable to 500°C. and oxidatively stable to about 350°C.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1966.150040624
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  • 5
    Electronic Resource
    Electronic Resource
    On the thermal behavior of 4-(o-carboranyl)-1-butylmethyl siloxane-dimethyl siloxane copolymersPresented at the 2nd Western Regional Meeting of the American Chemical Society, San Francisco, California, October 16-21, 1966. (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 2119-2131 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polysiloxanes containing carboranylbutyl and methyl pendant groups were investigated, to determine their resistance to thermal decomposition when heated in air. Results indicate that the copolymers degrade through Si—C as well as Si—O bond rupture. At 300°C. thermooxidative scission of pendant groups was the predominant reaction. whereas Si—O and Si—C bond rupture occurred at 500°C. Variations in the behavior of the copolymers studied suggest that the carborane nucleus provides some inhibiting influence on their thermal decomposition. This is mainly attributed to steric hindrance effects rather than polarity factors. Chain extension with tin octoate caused a reduction of thermal stability, probably because of the addition of Sn—O bonds to the molecules.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.150050828
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  • 6
    Electronic Resource
    Electronic Resource
    Studies in cyclopolymerization. II. Relative rates of addition in the copolymerization of acrylonitrile with certain 1,4-dienes (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 1648-1648 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1966.150040631
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  • 7
    Electronic Resource
    Electronic Resource
    Silicon-containing Schiff base and benzimidazole derivativesPresented at the Second International Symposium on Organometallic Chemistry, Madison, Wisconsin, August 30-September 3, 1965. (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 1081-1091 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Investigations were undertaken to obtain information for use in the development of new heat-stable polymers. Model silicon-containing Schiff base and benzimidazole derivatives were synthesized by reaction of p-(triphenylsilyl)-benzaldehyde with phenylenediamines. The structure and thermal stability of the products were studied. The reaction of p-(triphenylsilyl)benzaldehyde and o-phenylenediamine yielded N-p-(triphenylsilyl)benzylidene-o-phenylenediamine which readily oxidizes to form 2-p-(triphenylsilyl)phenylbenzimidazole. The di-Schiff bases, which most probably exist in trans-trans configurations, were obtained from reaction of the aldehyde derivative with m- and p-phenylenediamine. In contrast to similar Schiff bases without silicon, the products are soluble in organic solvents. The good resistance of the di-Schiff base and benzimidazole derivatives to thermal decomposition suggests that polymers with repeating units of such structures would also be heat-stable and might possess useful properties.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1966.150040510
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation and thermal stability of organometallosiloxanes and organometallic compounds (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 2307-2319 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This study covers the results of synthesis and investigation of thermal stabilities of several organometallosiloxanes and organometal compounds containing Group IV elements. Investigations indicate, in general, that heat resistance is related to the dissociation energies of the M—O bonds, the number of organic groups connected to the metal atom, and the structure of the molecule as a whole. More specifically, the substitution of Ge—O and Sn—O bonds for some Si—O linkages in organosiloxanes produces a reduction in heat stability. The influence of the Ge—O bond to decrease the resistance of siloxanes is less than that of the Sn—O linkage; an increase in the number of Sn—O linkages producing a corresponding decrease in heat stability of the organosiloxane. The resistances of the germoxysiloxanes to heat degradation are less than that which would be expected from indications given by the relative stabilities of more simple organometallic compounds.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1966.150040924
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  • 9
    Electronic Resource
    Electronic Resource
    Photodegradation of copolymers of methyl methacrylate and methyl acrylate at elevated temperatures (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 7 (1969), S. 1425-1435 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Four methyl methacrylate - methyl acrylate copolymers with molar ratios, MMA/MA, of 112/1, 26/1, 7·7/1, and 2/1 have been photodegraded at 170°C by 2537 Å radiation. The changes which occur in the molecular weight of the copolymers are typical of a random scission process and from these and volatilization data the extent of chain scission during the course of the reaction has been calculated. The pattern of volatile products is the same as that previously obtained in the thermal reaction at 300°C although there are a number of differences in detail. For example, only one in ten of the methyl acrylate units is liberated as monomer compared with one in four in the thermal reaction and the ratio CO2/chain scissions is considerably greater than the strict 1/1 ratio observed in the thermal reaction. Zip lengths are also very much greater in the photo reaction. These minor differences between the two reactions have been accounted for in terms of the mechanism previously presented to account for the thermal reaction, bearing in mind the differences in the temperature (170 and 300°C) at which the two investigations were carried out.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.150070606
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  • 10
    Electronic Resource
    Electronic Resource
    Damped torsional oscillator model for polymer molecules (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 6 (1968), S. 1177-1182 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: At present the widely used model for explaining viscoelastic and dielectric properties of polymer solutions is that of Rouse and Bueche. Here the polymer molecule is considered as an array of Gaussian subunits, each of which acts as an entropy spring. The motion of these segments is damped by the viscous drag of the surrounding solvent (RB model). An alternative model is presented, in which the segments are torsional oscillators consisting of two or three backbone links, and the damping is due to hindered internal rotation (DTO model). The mathematical treatment of these two models is essentially identical, but the physical interpretation of the constants used is very different. The DTO model has previously been applied by one of us to the interpretation of viscoelastic data. It is here applied to the interpretation of dielectric loss data. It is shown that dielectric measurements in dilute solution should very readily discriminate between the two approaches. Finally it is shown that the relaxation time computed from the DTO model is in closer agreement with published NMR data on poly(propylene oxide) 2025, than is the RB relaxation time. The postulates of the DTO model appear to be confirmed for this low molecular weight polymer. An even more sensitive distinction should be available by studies of the relaxation time as a function of polymer concentration.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.160060610
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